<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #header{
            height: 100px;
            background-color: aqua;
        }
        #banner{
            height: 200px;
            background-color: red;
        }
        #content{
            height: 550px;
            background-color: yellow;
        }
        #myleft{
            height: 550px;
            width: 30%;
            background-color: navy;
            float: left;
            margin-top: 0;
        }
        #myright{
            height: 550px;
            width: 70%;
            background-color: brown;
            float: left;
            margin-top: 0;
        }
        #footer{
            height: 50px;
            background-color: blue;
        }
    </style>
</head>
<body>
    <div id="header">管理系统</div>
    <div id="banner">轮播图</div>
    <div id="content">
        <div id="myleft">左侧部分</div>
        <div id="myright">右侧部分</div>
    </div>
    <div id="footer">页脚</div>
</body>
</html>